Is the function discrete or continuous?
the domain of the function is ?

The domain can either be discrete or continuous. A discrete function would have x-values that stand alone, but not have an interval around them. For example the number of children you have will be 0, 1, 2, 3, and so on, but nothing in between 1 and 2. A continuous function will have all values of x in an interval

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(a) the volume of the cone is 20/3 in3

hence, option a is correct.